Safe Material--Made of medical grade (better than food grade) BPA-free silica gel and non-toxic, odorless material; approved by FDA in the U.S.
Innovative Design--Soft and collapsible design, saves space when it's put away and makes it portable for outdoor use; its innovative air valve allows air to fill up the bottle and stands straight, even when it's empty or contains only a small amount of liquid
Practical to Use--Wide-mouthed (63 mm) design makes it easy to clean the interior or add water and ice; the leak proof one-button switch opens the cap easily; the lock ring prevents the bottle from accidentally opening